Zbigniew Jaworowski is chairman of the Scientific Council of the Central Laboratory for Radiological Protection in Warsaw, Poland -- an organization which refuses to disclose its funding source -- and has served on the United Nations Scientific Committee on the Effects of Atomic Radiation. He is a global warming skeptic and has connections to Exxon Mobil and Texaco through the Biological Effects of Low Level Exposures group -- a front group for corporate interests -- of which he is listed as an "international member." He also has ties to Exxon through the Heartland Institute. Dr. Jaworowski was a speaker at the 2008 International Conference on Climate Change, sponsored by the Heartland Institute.[citation needed]